relationtype

<xs:attribute name="relationtype" use="required">
  <xs:simpleType>
    <xs:restriction base="xs:token">
      <xs:enumeration value="cpfrelation"/>
      <xs:enumeration value="resourcerelation"/>
      <xs:enumeration value="functionrelation"/>
      <xs:enumeration value="otherrelationtype"/>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>